WO2015026359A1 - Dispositif dynamique de retenue du tissu avec ressort extra-plat - Google Patents

Dispositif dynamique de retenue du tissu avec ressort extra-plat Download PDF

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Publication number
WO2015026359A1
WO2015026359A1 PCT/US2013/056293 US2013056293W WO2015026359A1 WO 2015026359 A1 WO2015026359 A1 WO 2015026359A1 US 2013056293 W US2013056293 W US 2013056293W WO 2015026359 A1 WO2015026359 A1 WO 2015026359A1
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WO
WIPO (PCT)
Prior art keywords
spring
holding device
biasing spring
band
recited
Prior art date
Application number
PCT/US2013/056293
Other languages
English (en)
Inventor
Seth Arnold FOERSTER
Original Assignee
Dallen Medical, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dallen Medical, Inc. filed Critical Dallen Medical, Inc.
Priority to PCT/US2013/056293 priority Critical patent/WO2015026359A1/fr
Publication of WO2015026359A1 publication Critical patent/WO2015026359A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/82—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin for bone cerclage
    • A61B17/823—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin for bone cerclage for the sternum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/82—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin for bone cerclage

Definitions

  • the present invention is related to the general surgical repair of separated body tissues, and more particularly to internally fixating and stabilizing such body tissues, specifically bones.
  • the present invention solves the problems outlined above by providing a biasing system for a suture or banding system that does not adversely affect the band's ability to hold tissue together. This is done by removing most or all of the biasing mechanism from the path of the band. By placing the biasing mechanism to one or the other side of the tension path of the band, many desirable effects are realized.
  • the inventor has recognized that maximizing contact between the suture or band and the underlying bone or tissue is important to optimize healing. This is particularly relevant in the case of holding sternal halves together after they have been separated to access the thoracic cavity. Breathing, coughing, and any movement by the upper body impart larger forces in the repair held together by bands. Any biasing device must serve to augment or maintain the function of the bands. If this is not the case, coughing may induce stresses that concentrate on one part of the bone, causing the bands to cut into the bone. When the bands cut into the bone, the tension in the bands is released adversely, thus affecting their ability to help mend bone to bone.
  • a dynamic tissue holding device for dynamically holding two tissue portions in contact with one another.
  • the device comprises a biasing spring having a relatively low profile, and a band adapted for extending about the tissue portions to be held together.
  • the band has a first end for attachment to a first attachment portion on the biasing spring and a second end for attachment to a second attachment portion on the biasing spring.
  • the band establishes a path of tension along its length and extending linearly between the two ends of the band.
  • more than one-half of the biasing spring is disposed outside of the path of tension when the dynamic tissue holding device is in place and holding the two tissue portions together.
  • the biasing spring is disposed outside of the path of tension.
  • the height of the biasing spring is less than about 2 mm.
  • the biasing spring is formed to have a generally parabolic profile.
  • the band preferably comprises a braided band, or, alternatively, a cable.
  • the biasing spring comprises a first eyelet disposed in a center portion of the spring, for receiving the first end of the tensioning band, and a second eyelet disposed on an opposing side of the center portion of the spring, for receiving the second end of the tensioning band, wherein at least approximately four-fifths of the spring is disposed on either one side or the other of the first and second eyelets. More preferably, approximately two-fifths of the spring is disposed on one side of the first and second eyelets and approximately two-fifths of the spring is disposed on the other side of the first and second eyelets.
  • the space efficiency of the biasing spring is at least about 50%, and preferably at least about 57%.
  • the biasing spring comprises a first eyelet disposed on one edge of the spring, for receiving the first end of the tensioning band, and a second eyelet disposed on a second edge of the spring, for receiving the second end of the tensioning band, wherein substantially all of the biasing spring is disposed to one side of said eyelets.
  • a dynamic tissue holding device for dynamically holding two tissue portions in contact with one another, which comprises a biasing spring and a band adapted for extending about the tissue portions to be held together.
  • the band has a first end for attachment to a first attachment portion on the biasing spring and a second end for attachment to a second attachment portion on the biasing spring.
  • the height of the biasing spring is less than about 2 mm.
  • the biasing spring is formed to have a generally parabolic profile.
  • the band preferably comprises a braided band, or, alternatively, a cable.
  • the biasing spring comprises a first eyelet disposed in a center portion of the spring, for receiving the first end of the tensioning band, and a second eyelet disposed on an opposing side of the center portion of the spring, for receiving the second end of the tensioning band, wherein at least approximately four-fifths of the spring is disposed on either one side or the other of the first and second eyelets. More preferably, approximately two-fifths of the spring is disposed on one side of the first and second eyelets and approximately two-fifths of the spring is disposed on the other side of the first and second eyelets.
  • the space efficiency of the biasing spring is at least about 50%, and preferably at least about 57%.
  • the biasing spring comprises a first eyelet disposed on one edge of the spring, for receiving the first end of the tensioning band, and a second eyelet disposed on a second edge of the spring, for receiving the second end of the tensioning band, wherein substantially all of the biasing spring is disposed to one side of said eyelets.
  • Fig. 1 is an isometric view showing a sternum having bone halves which are being held together by a device constructed in accordance with the principles of the present invention, and also by a prior art device, for comparative purposes;
  • Fig. 2 is a top cross-sectional view of the prior art dynamic compression device shown in Fig. 1 ;
  • Fig. 3 is a top cross-sectional view similar to Fig. 2 of the dynamic compression device of the present invention also shown in Fig. 1 ;
  • Fig. 4 is a cross-sectional view of the sternum shown in Fig. 1 , illustrating the respective profiles of each of the prior art device and the inventive device;
  • Fig. 5 is an isometric view of a coiled spring for use as a drawbar spring in the prior art device of Fig. 2;
  • Fig. 6 is an isometric view similar to Fig. 5 of the prior art coiled spring in a compressed configuration
  • Fig. 7 is an isometric view of the device of the present invention in a compressed configuration
  • Fig. 8 is an isometric view similar to Fig. 7 of the device in an expanded configuration
  • Fig. 9 is an isometric view of an alternative embodiment of the invention, in its initial relaxed state
  • Fig. 10 is an isometric view similar to Fig. 9, illustrating the alternative embodiment is its tensioned, energy stored state.
  • a sternum 10 which is comprised of two bone halves 16 and 18.
  • the two bone halves have been separated, as is necessary for performance of open heart surgical procedures, or other procedures requiring access to the thoracic cavity.
  • To conclude the procedure it is necessary to re-join the bone halves 16 and 18 and to do so in a way that will ensure proper healing.
  • a dynamic compression device 12 which has been constructed in accordance with the principles of the present invention, is illustrated in a deployed orientation for holding the bone halves 16, 18 together. Also illustrated is atypical prior art dynamic compression device 14, also in a deployed configuration, for purposes of comparison. With reference also to Fig. 2, the prior art device 14 uses a biasing mechanism-suture configuration, wherein the biasing mechanism comprises a drawbar spring 26 which is placed directly in line with the tension of a length of suture 22. The biasing mechanism 26 serves to pull the bone halves 16 and 18 into each other by means of tensioning suture 22, thus holding the sternum 10 together so that it may heal.
  • the biasing mechanism comprises a drawbar spring 26 which is placed directly in line with the tension of a length of suture 22.
  • the biasing mechanism 26 serves to pull the bone halves 16 and 18 into each other by means of tensioning suture 22, thus holding the sternum 10 together so that it may heal.
  • the inventive device 12 functions to pull the upper intercostal spaces together by means of a braided band 20 and a biasing spring 24.
  • the braided band 20 may alternative comprise a cable and still be well within the scope of the present invention.
  • the entirety of the drawbar spring element 26 of device 14 can be seen to be directly in the path of the tension of suture 22.
  • four-fifths of the flat biasing spring 24 lies outside of the tension path of the band 20. This feature offers several significant advantages over the prior art approach.
  • Figs. 2 and 3 taken side-by-side, as well as Fig. 4, clearly demonstrate the advantageous features of the inventive device 12, respective to the typical prior art device 14.
  • Fig. 2 is a top cross-sectional view of the prior art device 14, as situated on a patient's sternum 10
  • Fig. 3 is a similar cross-sectional view showing the inventive device 12 similarly situated on the patient's sternum.
  • Fig. 4 is a cross- sectional view, perpendicular to the osteotomy showing bone half 16, and extending through the sternum and devices 12 and 14 (see Fig. 1).
  • the profile of the inventive device 12 can be easily compared to that of the prior art device 14.
  • the aspect ratio may be used as a measurement of the profile.
  • the aspect ratio of device 12 is defined as the height 31 of the device above the bony surface, divided by the length 33 of the device. In the illustrated embodiment of device 12, its aspect ratio is approximately 1/10. Other suitable inventive devices may have aspect ratios of up to about 1 ⁇ 2 and still realize substantial benefits of the present invention. In contrast, the prior art drawbar spring device 14 has an aspect ratio of its height 27 divided by its length 29, which is approximately 1.
  • Both of the devices 12 and 14 are constructed of a suitable known medical grade material, preferably surgical stainless steel, to thereby yield similar performance characteristics which are necessary to supply dynamic compression to sternal halves 16, 18 so that optimum healing may occur.
  • Sternal halves 16, 18 also represent a typical sternal cross-section in its width of approximately 24 mm.
  • the width of the sternum 10 ends up being a critical dimension in the procedure.
  • the width of an adult sternum may range from 18 to 80 mm, but the tissue may not be dissected to access its entire width. While dissection may be done to accommodate larger devices, such trauma to tissue should be avoided.
  • the figures show a sternal width of approximately 24 mm as this is the common dissected width used to accommodate the saw used for the initial osteomety.
  • the prior art device 14 is too large to function correctly.
  • the suture 22 is unable to wrap around the bone appropriately, causing gaps 42 and 44.
  • the gaps 42 and 44 cause the suture 22 to pull the device 14 directly into the sternal halves 16 and 18. This causes a rise in suture tension to realize the same compression between sternal halves 16 and 18, should gaps 42 and 44 not be present.
  • the tension is such, in the system of device 14, that it is likely that arms 38 and 40 of the device will bend to the point of affecting the returning function of the spring 26.
  • the net effect is that the device 14 cannot supply the same compression between the sternal halves 16 and 18 as is the case with the inventive device 12, even though the springs 26 and 24, respectively, have substantially the same spring constants and are fabricated of the same material.
  • the width 29 of the prior art device 14 is twice the width 33 of the inventive device 12.
  • the inventive device 12 also shows smaller gaps, with the band 20 lying on the bone surfaces 34, 36, enabling the band 20 to hold tension on both sides of the bone.
  • the dermal layer on top of the sternum is rather thin. Even when a surgeon employs only twisted wire to repair the sternum, some patients can feel that wire under their skin. Consequently, the profile of a closure device can have cosmetic as well as practical concerns.
  • the dermal layer over the sternum on an average adult female is 5 to 10 mm thick.
  • the prior art device 14 has a height 27 of
  • the device 14 presents a much higher profile off the sternum 10 (the difference in profile between the two devices being shown as reference numeral 32) than does the inventive device 12, which has only a height 31 (Fig. 4) of about 1.8 mm off the sternum.
  • the profile of the inventive device 12 is spread out over a large surface area, resulting in a much more favorable aspect ratio, it will not be easily seen when viewing the patient from the outside.
  • Figs. 5 and 6 illustrate the drawbar 26 of the prior art device 14 in greater detail.
  • Fig. 5 illustrates the coiled spring 52 in its initial, untensioned configuration.
  • An eyelet 54 is connected to the arm 38, which moves freely through an end cap 50 and is solidly attached to an end cap 48.
  • Eyelet 56 is connected to the arm 40, which moves freely through the end cap 48 and is solidly attached to the end cap 50.
  • the spring 52 is trapped between the end caps 50 and 48. As the eyelets 54 and 56 are drawn apart, as is needed to tension the suture, end caps 50 and 48 are drawn together, thus compressing the spring 52 and causing the spring 52 to store energy as shown in Fig. 6.
  • Fig. 1 clearly shows the width requirement for the device on the top surface of the sternum
  • Figs. 2 and 4 show the deficiencies of the drawbar spring design
  • Fig. 5 illustrates how the drawbar spring is inherently a poor design.
  • the eyelets 54 and 56 are necessarily placed outside of the ends of spring end caps 48 and 50. It is because of the way that the drawbar design is assembled that this must be so. Eyelets 54 and 56 are then pulled farther apart to fully compress the spring 52.
  • the space efficiency of the device 12 is an important design criteria.
  • a smaller, more efficient spring enables the device 12 to be used in more scenarios with less trauma to the patient.
  • a material is capable of storing energy based on its volume. How that energy is stored and released is based on the length of the material and its cross-section.
  • Both devices 12 and 14 have been designed to have equivalent performance both in energy stored and in the delivery of the energy.
  • the space efficiency of the spring is defined as the total space it occupies divided by the space or volume the spring material actually physically occupies.
  • the spring wire is .040 in. in diameter, and makes 7.5 revolutions.
  • the spring itself is .210 in. in diameter and is .475 in.
  • the space efficiency of the device 14 is the volume of the spring wire divided by the volume occupied by the spring, which equals 32%. Note that the end caps 50 and 48, and the arms 38 and 40 are left out of this calculation because they do not store energy. There is also some design space beneath the spring, between the bone and the spring that is not used and could be used by other designs. With this space included, the space efficiency of the device 14 drops to 28 %.
  • the inventive device 12 more than doubles this space efficiency at 57%, by following a few innovative precepts.
  • the inventive device more closely spaces the eyelets 60 and 62, thereby eliminating the dead space in the width of the design.
  • the spring cross-section is rectangular, thus eliminating the wasted space brought on by a wire.
  • the spring starts in its most compacted state, widthwise, so that spaces between the spring elements do not contribute to the width of the device.
  • the spring 24 as shown particularly in Figs. 7 and 8 is fabricated from a flat sheet of material.
  • Grooves 68 are made as small as possible, using the smallest cutter possible.
  • a presently preferred cutting method is by a Wire Electrical Discharge Machine (wire EDM), because it can accurately cut the parabolic profile of the springs which is necessary for an optimum spring performance.
  • wire EDM Wire Electrical Discharge Machine
  • alternative cutting approaches may utilize laser, plasma cutters, band saws, water jets, photo etching, etc., wherein the cutting process enables a high density of biasing elements, and wherein the cutting process achieves such a high density by cutting the left side of one element and the right side of another element using the same cut. Cutting these slots using just one pass of the machine also shortens machining time, which lowers the cost of the device.
  • Fig. 8 illustrates the spring 24 in its expanded state, storing all of the energy needed to force the tissues under the suture in compression throughout the healing cycle.
  • approximately 4/5 of the spring is disposed above the line A and below the line B, such that approximately 4/5 of the spring lies outside of the tension path of the band 20, as discussed above
  • approximately 2/5 of the spring lies above the line A and approximately 2/5 of the spring lies below the line B.
  • all approximately 4/5 of the spring lies substantially entirely on one side or the other of the eyelets. This enables the width of the device to be as small as possible.
  • Figs. 9 and 10 illustrate another embodiment of the present invention, wherein the entire spring element 76 is paced to one side of suture eyelets 72 and 74.
  • Fig. 9 shows the spring element in its initial relaxed state
  • Fig. 10 shows the embodiment in its tensioned, energy stored state.
  • inventive concept is disclosed as being particularly adapted for use in repairing the sternum after a thoracic cavity procedure, it is, of course, applicable to a great many other procedures requiring repair of bodily tissue, particularly bone.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

La présente invention concerne un dispositif dynamique de retenue de tissu destiné à retenir dynamiquement deux parties de tissu en contact l'une avec l'autre. Le dispositif comprend un ressort de déflexion ayant un profil relativement plat, et une bande conçue pour s'étendre autour des parties de tissu à retenir ensemble. La seconde bande a une première extrémité destinée à être fixée à une première partie de fixation sur le ressort de déflexion et une seconde extrémité destinée à être fixée à une seconde partie de fixation sur le ressort de déflexion. La bande définit une trajectoire de tension sur sa longueur et s'étend linéairement entre les deux extrémités de la bande. Avantageusement, plus de la moitié du ressort de déflexion est disposée à l'extérieur de la trajectoire de tension lorsque le dispositif dynamique de retenue du tissu est en place et retient ensemble les deux parties de tissu.
PCT/US2013/056293 2013-08-22 2013-08-22 Dispositif dynamique de retenue du tissu avec ressort extra-plat WO2015026359A1 (fr)

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PCT/US2013/056293 WO2015026359A1 (fr) 2013-08-22 2013-08-22 Dispositif dynamique de retenue du tissu avec ressort extra-plat

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PCT/US2013/056293 WO2015026359A1 (fr) 2013-08-22 2013-08-22 Dispositif dynamique de retenue du tissu avec ressort extra-plat

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11266452B2 (en) 2020-06-03 2022-03-08 DePuy Synthes Products, Inc. Orthopedic cable retension device and methods of production and use thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5797915A (en) * 1996-04-17 1998-08-25 Pierson, Iii; Raymond H. Cerclage system
US20110313435A1 (en) * 2010-06-16 2011-12-22 Dallen Medical, Inc. Suture buckle with selective friction
US8303591B1 (en) * 2008-03-18 2012-11-06 Dallen Medical, Inc. Load shaping for dynamic tensioning mechanisms and methods
US20120323241A1 (en) * 2011-06-17 2012-12-20 Figure 8 Surgical, Inc. Sternum band tensioner device, system and method
US8414599B1 (en) * 2007-12-31 2013-04-09 Dallen Medical, Inc. Dynamic suture tensioning device and methods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5797915A (en) * 1996-04-17 1998-08-25 Pierson, Iii; Raymond H. Cerclage system
US8414599B1 (en) * 2007-12-31 2013-04-09 Dallen Medical, Inc. Dynamic suture tensioning device and methods
US8303591B1 (en) * 2008-03-18 2012-11-06 Dallen Medical, Inc. Load shaping for dynamic tensioning mechanisms and methods
US20110313435A1 (en) * 2010-06-16 2011-12-22 Dallen Medical, Inc. Suture buckle with selective friction
US20120323241A1 (en) * 2011-06-17 2012-12-20 Figure 8 Surgical, Inc. Sternum band tensioner device, system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11266452B2 (en) 2020-06-03 2022-03-08 DePuy Synthes Products, Inc. Orthopedic cable retension device and methods of production and use thereof

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